Automatic shower for removing a broken web from a fourdrinier wire



April 12, 1966 G. 1.. NELSON 3,

AUTOMATIC SHOWER FOR REMOVING A BROKEN WEB FROM A FOURDRINIER WIRE FiledJune 6, 1963 2 Sheets-Sheet 1 A ril 12, 1966 e. L. NELSON 3,245,872

AUTOMATIC SHOWER FOR REMOVING A BROKEN WEB FROM A FOURDRINIER WIRE FiledJune 6, 1965 2 Sheets-Sheet 2 United States Patent 3,245,872 AUTOMATICSHOWER FGR REMDVING A BRO- KEN WEB FROM A FOURDRINIER WIRE George L.Nelson, Westwood, Mass., assignor to Bird Machine Company, SouthWalpole, Mass, a corporation of Massachusetts Filed June 6, 1963, Ser.No. 286,005 10 Claims. (Ql. 162-255) This invention relates tointermittently operable fluid jets and in particular to apparatus forrapidly init1ating the flow of a number of spaced-apart fluid jets. Itis a principal aim of the invention to enable the construction ofv asimple apparatus incorporating a large number of jet nozzles, e.g. asmany as 30 or 60, that are spaced apart along a fluid supply conduit,for example, at intervals of 5 inches, in which the nozzles can be allconverted from completely sealed condition to full flowing conditionwithin a fraction of a second.

The invention has particular application to Fourdrinier paper-makingmachines which have endless, traveling, web-forming wires. In suchmachines, after formation the web is normally removed from the wire atthe couch roll and thereafter processed. Occasionally, due to thefailure of the removal or processing machinery or due to imperfectionsin the web, the web breaks and adheres to the wire. The web then movesdownwardly with the wire about the couch roll and rearwardly toward theouter rolls that support the bottom length of the wire. It is well knownthat this broken web, if allowed to remain upon the wire, can causedamage to the wire as it passes over the outer support rolls, and willfoul the machine.

To avoid such difficulties with a broken web a series of water jets havebeen directed from within the wire loop downwardly through the bottomlength of the wire to dislodge or knock-01f the web, and cause it tofall into the couch pit. But continual operation of the water jets isvery disadvantageous in that large amounts of water are continuallyadmitted to the system which causes extreme dilution and cooling, andrequires substantial pump ing capacity. Hence there has been a need foran intermittent fluid jet apparatus which can normally be sealed, butwhich can rapidly be initiated upon the occurrence of a break in the webto remove the web from the traveling wire. But no intermittent jetapparatus has been available that adequately provides the number offeatures necessary for use with paper machines.

One of the needed features is that the fluid jet must be actuatable veryquickly. The length of traveling wire that extends from the couch rollto the first outer support roll for the wire is only on the order of 8to 10 feet while the wire may travel at speeds on the order of 2500 feetper minute or higher. Such short distances and high speeds impose thelimitation that the break must be detected and fluid jets across thefull width of the wire must be initiataed within as little as /5 of asecond if the web is to be removed before it is compressed against thewire by the first outer support roll.

Another needed feature is that the jet apparatus must be mountablewithin the loop of the traveling wire, and must be substantiallyself-supporting. In a typical installation the traveling wire may have awidth of 200 inches, and, for example, where the fluid employed is waterand the nozzles have an adequate effect if spaced on 5 inch centers, 40jet nozzles are required. To be practical with such a large width wire,the nozzles and the pipe must be lightweight and small, for otherwiseextremely heavy and expensive piping or complicated supporting structurewithin the loop of the traveling wire would be required.

Other needed features are that the intermittent jet nozzles be simpleand inexpensive to manufacture and maintain.

Accordingly, it is a principal object of this invention to provide anintermittent jet apparatus for a Fourdrinier paper-making machine inwhich the nozzles are normally sealed against any flow, but in which thenozzles throughout the width of the paper-making machine can be actuatedwithin a fraction of a second, preferably within /5 of a second.

Another object of the invention is to provide a jet apparatus which canemploy a single control valve for the rapid actuation of the entireapparatus, and only one moving member in each of the valve nozzles.

Another object of the invention is to provide a jet apparatus which,after actuation is completely self-sealing and reset by the mere closingof a single control valve.

Another object of the invention is to provide a jet apparatus in which asingle seal member seals completely the only outlet passage of eachnozzle with no secondary outer seal or other complicated mechanismextending beyond the first seal, and with no leaking from the apparatus.

Other objects of the invention are to provide a jet apparatus which issmall and lightweight, is simple to manufacture, has few machinedsurfaces and few parts that can wear out, is noncri-tical with respectto machining tolerances and is selfadjusting.

While from one point of view the invention is a substantial andimportant improvement in the rapid removal of broken webs from a papermachine wire, the apparatus inherently has advantages which may becalled upon for other applications in the paper and pulp industry, andindeed for other uses.

The invention lies in part in the realization that for a passage thathas a reasonable cross-sectional area and that is as long as the widthof the traveling wire of a paper machine, if the passage already ischarged with pressurized fluid, the pressure drop produced by dumpingthe passage from an end thereof can propagate through the length of thepassage so effectively that said pressure drop can be used to unseal aseries of nozzles very quickly; furthermore, in part the invention liesin a simple structure that efficiently utilizes this principle.

Broadly, the structure of the invention includes a series ofspaced-apart nozzles each having a movable means which can move to sealand unseal the nozzle outlet with respect to a fluid supply, an extendedcontrol manifold adapted to be filled with fluid under pressure, anddump means to drop the pressure in the manifold when desired.Propagation of the pressure drop in the control manifold causes all ofthe movable means to move to their unsealed positions. Various movementsof the movable means, pivotal as well as translational, are comprehendedby the invention in its broadest scope, but an important aspect of theinvention is that a single, reciprocating member can be employed foreach nozzle with a working surface exposed to the control manifoldpressure. Various means such as springs can be employed to keep themovable means in the fully sealed position when the control manifoldpressure is not dropped, but it is also an important aspect of theinvention that simple fluid pressure can be employed for this purposewhile obtaining fast action.

Advantageously, the dump means includes a detector that senses thecondition that requires the fluid jets and a dump valve that responds tothe detector to dump the control manifold. In the context of theFourdrinier papermaking machine, a web break detector is positioned nearthe couch roll for monitoring the normal removal of the web from thewire. When normal removal fails, the detector transmits a signal to openthe dump valve to suddenly decrease the pressure in the controlmanifold.

' These and other important features and advantages of the inventionwill be explained in conjunction with the drawings wherein:

FIG. 1 is a side view, partially broken away, of the preferredembodiment of an intermittent jet apparatus according to the invention;

FIG. 2 is a transverse cross-sectional view taken on line 22 of FIG. 1showing one of the nozzles thereof partly in cross-section;

FIG. 3 is a diagrammatic side view of part of a papermaking machineemploying the apparatus of FIGS. 1 and 2;

FIG. 4 is a perspective view, partially broken away, of the jetapparatus and traveling wire of the machine of FIG. 3;

FIG. 5 is a diagrammatic side view, similar to FIG. 3 of anotherembodiment of a paper-making machine employing the present invention;

FIG. 6 is a vertical cross-sectional view of another embodiment of theinvention.

Referring to the embodiment of FIG. 1, the fluid jet apparatus 10comprises a multiplicity of fluid jet nozzles 11 mounted in aspaced-apart relation along elongated pipe 12. An elongated dividingwall 14 extends within the pipe substantially the entire length thereof.At one end of the dividing wall 14, a tranverse wall 16 seals dividingwall 14 to one side of pipe 12 and at the opposite end of transversewall 18 seals the dividing wall 14 to the other side of the pipe 12,whereby elongated zones on opposite side of the dividing wall 14 aresubstantially sealed from each other. The first zone comprises anelongated supply conduit 20 for the nozzles 11, and communicates with apipe extension 22 terminating at flange 24 that is adapted to beconnected to a source 26 of pressurized fluid. The second zone comprisesan elongated control manifold 28 which communicates with a pipeextension 32 forming a reservoir 34. A dump valve 36 is connected toreservoir 34 and dump piping 37. End supports 38 and 40 are connected tothe ends of the pipe for supporting an extended length of pipetherebetween, for instance, within the loop of a traveling paper machinewire.

In this embodiment the filling means for the control manifold 28comprises a leakage path from supply conduit 20, defined here by arestricted opening 41 in the dividing wall 14, although a means entirelyseparate from the fluid supply could be employed.

Referring to FIG. 2, in conjunction with FIG. 1, each nozzle 11 of thispreferred embodiment has means defining an outlet passage 42, meansdefining one or more supply passages 44 communicating with supplyconduit 20, means defining a movable piston 48 for moving the sealsurface 46 and guide means 50 for guiding the movement of the piston.

In this embodiment the means that defines the outlet passage 42comprises a nozzle head 52, the outlet passage beginning at a hollowconical valve seat 54, the large end of which communicates with supplypassage 44, and the smaller end of which communicates directly with flowgoverning passage 56, the latter aligned to discharge against jetdeflector surface 58 from which the fluid jet is emitted.

In this embodiment the guide 50 for the piston 48 comprises the surfacesbonding a chamber 59 defined by tubular member 60. This tubular memberextends from the outlet passage transversely through the supply conduit20, having its inner end 62 in communication with control manifold 28.An outer portion 64 of the tubular member 60 projects through theportion of the pipe wall that defines the supply conduit 20, beingsealed by a weld 66 to the pipe wall. Threads 67 on the outer end oftubular portion 64 cooperate with a means 65 for connecting the nozzlehead 52 to the tubular member 60. The supply passage 44 is provided byone or more holes 68 extending through the side wall of the tubularmember 60.

In this embodiment the means defining the seal surface 46 is ofspherical configuration, an annular surface portion 76 of which isadapted to engage a circular por tion of the conical seat 54 with theend surface portion 78 then exposed to the flow governing passage 56through the only outlet of the nozzle. The seal surface 46 is closed andadapted to seal the outlet completely, the area of end surface 78 beinggreater than the crosssectional area of flow governing passage 56.

In this embodiment the movable piston 48 has a work-' ing surface 72directed toward the control manifold 28. The sides 74 of the piston 48preferably fit closely to the walls of the tubular member 60 to define arestriction to the flow of fluid between the supply passage 44 and thecontrol manifold 28 to enhance the effect of pressure drop upon theworking surface 72.

The working surface 72' of the piston member disposed in the oppositedirection from working surface 72 is exposed to fluid in the nozzle, andthe end surface 46 is exposed to the atmosphere when sealed. The pistonsurfaces are constructed and arranged so that drop inpressure in thecontrol manifold 28 from a first level will unseat the piston from thesealed position (solid lines FIG. 2) to the unsealed position (dottedlines FIG. 2} and restoration of the pressure will restore the piston tothe sealed position. Advantageously, when employing the leakage path 41to fill the control manifold 28, the first pressure level for sealing issubstantially equal to the supply pressure for conduit 20. Atmosphericpressure acts through outlet passage 42 upon end surface 78 to causeannular surface 76 to engage the conical seat 54. Decrease of the fluidpressure in the control manifold 28 unbalances the forces acting uponthe piston 48, and the piston 48 is displaced in straight line-movementtoward the control manifold 28, unsealing said outlet passage 42relative to said supply passage 44.

Advantageously, the working end of piston 48 has an annular, sphericalportion 73 and the tubular member 60 has a narrowed portion 61 ofsmaller diameter than piston 48 which serves two functions. First,portion 61 defines a secondary valve seat 63 to be engaged by piston 48to positively seal the nozzle from control manifold 28 when the piston48 moves to the unsealed position (dotted lines FIG. 3). This preventsleakage into the control manifold 28, quickening the propagation of thepressure drop throughout the elongated control manifold 28. The secondfunction of the narrowed portion 61 is to limit the movement of thepiston toward the control manifold 28.

To rapidly initiate the drop in pressure in the control manifold 28 whena fluid such as water is employed, it is advantageous that the flowcross-section of the dump valve 36 be greater than that of the controlmanifold 28, that the reservoir 34 be provided with a flow cross-sectiongreater than that of said control manifold 28, that the dump valve 36 beconnected to the reservoir 34 and have downwardly sloping drain piping37 to take advantage of the gravity effect for aiding the movement ofthe fluid. The dump valve 36 is suitable for remote actuation and isadvantageously combined with a detector 35 that is adapted to sense theconditions of the process with which the jet apparatus 10 is to be used,the detector 35 adapted when a predetermined condition is sensed tocause the dump valve 36 to open.

Referring to FIGS. 3 and 4, the jet apparatus 10 is adapted to be usedwith a Fourdrinier paper machine 80. In such a machine the Fourdrinierwire 84 has a straight upper section upon which a web is formed, thewire turning downwardly about couch roll 85 and proceeding through areturn path to the head box 86 to complete its loop, passing over afirst outer support roll 87 and thence over a number of further supportrolls before reaching head box 86. The formed web 88 is removed from thewire in the vicinity of the couch roll 85 by a suction pickup roll 90and upper and lower traveling felts 92 and 94, respectively. If the web88 breaks or the removal means 90 fails to normally remove the web 88for some other reason, the web 88 travels along with the wire 84rearwardly toward the first outer support roll 87. Before the broken webreaches outer support roll 87 the web must be dislodged from the wire,preferably deposited in couch pit 96 below the couch roll 85.

Referring to FIGS. 3 and 4, the elongated pipe of apparatus of FIGS. 1and 2 is mounted by its end brackets 38 and 40 within the loop of theendless traveling wire 84, with the nozzles 11 positioned to directfluid jets through the wire 84, which is perforate, to direct broken webinto the couch pit 96. The flange 24 is connected to a source 26 ofpressurized fluid and the dump valve 36 is mounted to discharge to theatmosphere. The detector 35 in this embodiment comprises a photoelectricsystem comprising a light beam source 97 located within the loop of thewire 84 and a light-sensitive device 98 aligned therewith, locatedoutside the loop. The detector is quiescent when the light beam passesthrough the perforate wire 84 and impinges on the light-sensitive device98, which occurs whenever the web is being normally removed by theremoval means 90. In the event the web 88 is not removed in the normalmanner from the wire, the light beam is interrupted by the broken webwhich adheres to the wire. A relay 100 is actuated by the lightsensitivedevice 98 upon the interruption of the light beam, and the relay 100activates a solenoid 102 which opens dump valve 36.

In preparing for normal operation, the dump valve 36 is closed andleakage from the supply conduit through the restricted opening 41 to thecontrol manifold 28 causes the control manifold 28 to be charged withpressurized fluid. When the fluid employed is a liquid, a float valvecan be connected to the upper part of control manifold 28 to releaseentrapped air and close when the manifold is filled, or a fluid flow canbe initiated through the control manifold to purge it of air beforeclosing the dump valve. When the static pressure in the control manifold28 reaches substantially the total supply pressure from source 26, theforce upon the working surface 72 of each of the pistons 48 forces thepiston towards the outlet passage 42 and causes the seal surface 46 toengage conical seat surface 54 to seal the outlet passage 42 from thesupply passage 44. The jet apparatus is then ready for operation.

When a break occurs in the web 88, the web 88 moves with the wire 84past the light beam emitted by light source 97, the failure of normalweb removal is sensed by the interruption of the light beam, thelight-sensitive device 98 generates a signal which through relay 100actuates solenoid 102 to quickly open dump valve 36. Such opening of thedump valve releases the pressure of the fluid in the control manifold 28at the dump valve 36,

and this pressure drop quickly propagates throughout the length of themanifold 28. As the pressure drop reaches each nozzle 11, the totalforce acting upon working surface 72 is overcome by forces actingoppositely which drives the piston 48 towards the control manifold 28unseating seal surface 46 from the conical seat 54, initiating a jet ofliquid through the outlet passage 42.

The jet of fluid from all of the nozzles blast through the wire 84 anddislodge the full width of the web 88, discharging it into the couch pit96. The jets continue until the operators of the paper-making machinecorrect the condition and again cause the removal means 90 to properlyremove the web 88 from the wire 84, then the dump valve 36 is closed,the pressure allowed to build up in the control manifold 28 again byleakage through restricted opening 41 and the jets stop as the pistons48 are returned to their sealing position, the jet apparatus remainingsealed against even slight leakage, until the next break occurs.

In a typical example, the paper machine wire 84 may be 200 inches wide,the pipe 12 may have a diameter of 3 inches and extend the full width ofthe wire, 40 liquid nozzles may be mounted on the pipe spaced on 5-inchcenters, the cross-sectional area of the elongated control manifold maybe on the order of 40 percent of the total cross-sectional area of thepipe, the valve 36 may be a 2 /2 inch solenoid-operated quick-actingvalve, the solenoid being operable in about 1 to 5 cycles of 60-cyclecurrent, and the light source and light-sensing device 97 and 98 or aseries of them across the width of the wire may comprise a standardphotoelectric system capable of actuating a relay in .06 second afterthe light beam is interrupted. From the time the light beam isinterrupted until all of the nozzles are actuated, approximately /5 of asecond will elapse.

Actual running tests of the pipe and nozzles alone when filled withwater have yielded a full width jet action Within of a second from thestart of opening the dump valve 36.

Referring to FIG. 5, unlike the embodiment of FIGS. 3 and 4, the web 88is not covered by a felt immediately upon being removed from the couchroll and the photoelectric system 97', 98' is positioned to sense theweb itself, the light-sensitive device 98 being quiescent when no lightbeam reaches it. Upon the breaking of the web, the web adheres to thewire 84 and does not pass between the light devices. The light beam fromsource 97' then reaches light-sensitive device 98' which actuates thedump valve in substantially the same manner as in the embodiment ofFIGS. 3 and 4.

Referring to the embodiment of FIG. 6, the most significant differencefrom the apparatus already described is the complete isolation of thecontrol manifold 28 from the supply conduit 20'. In this embodiment abullet shaped movable member 108 is employed having a working surface110 disposed in passage 112 that communicates through a working surfaceport 113 with the control manifold 28. The rounded end 109 of movablemember 108 is adapted to engage a conical seat with the peripheralportion of the rounded end exposed to the pressure of the supply conduit20' through supply port 117 and with the inner portion exposed to theatmosphere when sealed. Guides 114, 116 constrain the movable member toreciprocal movement. A rubber tubular diaphram 120 of the type thatturns upon itself is secured to the movable member and to the wall 122of the passage 112, absolutely sealing the control manifold from thesupply passage while permitting reciprocal movement of member 108. Avalve 124 communicates with control manifold 28 to fill it withinexpensive fluid such as water or even compressed air, a dump valve 126is provided to produce the flow from control manifold 28 and a supplyvalve 128 is provided for supply conduit 20', adapted to supplyrelatively expensive or dangerous fluid, e.g. perfume, to the nozzles.The operation of this em- ;bodiment is the same as above, the movablemember movable to upper and lower positions in accordance with theconditions at the working surface port relative to the conditions at thesupply port.

It will be understood that numerous of the specific details and the modeof use can be varied within the spirit and teachings of the invention.

What is claimed is:

1. Apparatus for use in a process that requires, when a predeterminedcondition occurs, the rapid automatic initiation of normally sealedspaced apart fluid jets, said apparatus comprising a multiplicity ofspaced-apart nozzles, a fluid supply manifold for continuouslyfurnishing fluid under supply pressure to said nozzles, an extendedrigid-walled control manifold normally filled with fluid under pressurewhen said jets are not initiated, and dump means to drop the fluidpressure in said control manifold; each of said nozzles defining anoutlet passage through which a jet of fluid can pass, each of saidnozzles having independent piston means movable relative to said controlmanifold, said piston means having oppositely directed working surfacesand movable between sealed and unsealed positions with respect to saidoutlet passage, said control manifold being in direct fluidcommunication with one working surface of said piston means of each ofthe nozzles and said supply manifold being in direct fluid communicationwith the oppositely directed working surface of said piston means, saidmanifolds and said working surfaces of said piston means arranged tocause fluid pressure to act directly on said piston means to move saidpiston means to said sealed and unsealed positions, the piston meansbeing maintained in said sealed position when the pressure in saidcontrol manifold is not dropped and in unsealed position when thepressure in said control manifold is dropped, and a dump means actuatorfor receiving a signal from a detector for said predetermined conditionand automatically actuating said dump means upon receipt of said signal.

2. The apparatus of claim 1 wherein said manifold and nozzle structureis adapted for rapidly and automatically initiating said jets throughthe wire of a Fourdrinier webforming machine to dislodge the webtherefrom in the event said web is not normally removed, said dump meanscomprising a remotely actuatable dump valve connected to said controlmanifold, and a web break detector means for actuating said dump valve,said detector constructed and positioned to sense the failure of normalremoval of said web from said traveling wire and upon such occurrence toopen said dump valve.

3. The apparatus of claim 1 including in combination a detector to sensethe occurrence of said predetermined condition and activate said dumpmeans.

4. The apparatus of claim 1 wherein said control manifold is in directlimited fluid communication with said supply manifold, said apparatusthereby operated with a single source of pressurized fluid.

5. The apparatus of claim 1 wherein each of said piston means has asecondary sealing surface, means defining a secondary valve seatpositioned to be contacted by said secondary sealing surface when saidpiston means is in said unsealed position, thereby preventing the fluidin said supply manifold from entering said control manifold.

6. The apparatus of claim 1 wherein each of said nozzles includes ametering passage independent from said piston means and located in saidoutlet passage at a point spaced from said piston means in said sealedposition, said metering passage sized smaller than the sealing portionof said piston means to control the fluid flow out of said nozzle.

7. The apparatus of claim 1 wherein said extended control manifoldcommunicates with a source of pressurized liquid and dump piping isprovided to conduct liquid from said dump means, said dump pipingdirected downwardly to enable gravity effect upon said liquid flowingfrom said dump means to aid in producing a pressure drop in said controlmanifold.

8. The apparatus of claim 1 wherein a reservoir is provided in opencommunication with said control manifold, said reservoir having a flowcross-section greater than that of said control manifold.

9. The apparatus of claim 1 wherein said piston means operates through aseal to prevent fluid communication between said control manifold andsaid supply manifold.

10. The apparatus of claim 9 wherein said seal is a flexible diaphram.

References Cited by the Examiner UNITED STATES PATENTS 1,057,780 4/1913Sheldon 239108 2,803,499 8/1957 Goyette et a1. 239l09 2,829,005 4/1958Broughton 239113 3,073,529 1/1963 Baker 239-1 13 3,097,992 7/1963Strempel 162-255 3,097,993 7/1963 Goddard 162--255 DONALL H. SYLVESTER,Primary Examiner.

MORRIS O. WOLK, Examiner.

1. APPARATUS FOR USE IN A PROCESS THAT REQUIRES, WHEN A PREDETERMINEDCONDITION OCCURS, THE RAPID AUTOMATIC INITIATION OF NORMALLY SEALEDSPACED APART FLUID JETS, SAID APPARATUS COMPRISING A MULTIPLICITY OFSPACED-APART NOZZLES, A FLUID SUPPLY MANIFOLD FOR CONTINUOUSLYFURNISHING FLUID UNDER SUPPLY PRESSURE TO SAID NOZZLES, AN EXTENDEDRIGID-WALLED CONTROL MANIFOLD NORMALLY FILLED WITH FLUID UNDER PRESSUREWHEN SADI JETS ARE NOT INITIATED, AND DUMP MEANS TO DROP THE FLUIDPRESSURE IN SAID CONTROL MANIFOLD; EACH OF SAID NOZZLES DEFINING ANOUTLET PASSAGE THROUGH WHICH A JET OF FLUID CAN PASS, EACH OF SAIDNOZZLES HAVING INDEPENDENT PISTON MENS MOVABLE RELATIVE TO SAID CONTROLMANIFOLD, SAID PISTON MEANS HAVING OPPOSITELY DIRECTED WORKING SURFACESAND MOVABLE BETWEEN SEALED AND UNSEALED POSITIONS WITH RESPECT TO SAIDOUTLET PASSAGE, SAID CONTROL MANIFOLD BEING IN DIRECT FLUIDCOMMUNICATION WITH ONE WORKING SURFACE OF SAID PISTON MEANS OF EACH OFTHE NOZZLES AND SAID SUPPLY MANIFOLD BEING IN DIRECT FLUID COMMUNICATIONWITH THE OPPOSITELY DIRECTED WORKING SURFACE OF SAID PISTON MEANS, SAIDMANIFOLDS AND SAID WORKING SURFACES OF SAID PISTON MEANS ARRANGED TOCAUSE FLUID PRESSURE TO ACT DIRECTLY ON SAID PISTON MEANS TO MOVE SAIDPISTON MEANS TO SAID SEALED AND UNSEALED POSITIONS, THE PISTON MEANSBEING MAINTAINED IN SAID SEALED POSITION WHEN THE PRESSURE IN SAIDCONTROL MANIFOLD IS NOT DROPPED AND IN UNSEALED POSITION WHEN THEPRESSURE IN SAID CONTROL MANIFOLD IS DROPPED, AND A DUMP MEANS ACTUATORFOR RECEIVING A SIGNAL FROM A DETECTOR FOR SAID PREDETERMINED CONDITIONAND AUTOMATICALLY ACTUATING SAID DUMP MEANS UPON RECEIPT OF SAID SIGNAL.